package org.chen.wordwave.tools.md5;

import android.util.Log;

import java.security.MessageDigest;

public class MD5Utils {
    private static final String[] hexDigIts = {"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"};

    public static String MD5Encode(String origin, String charsetName){
        String resultString = null;
        try{
            resultString = origin;
            MessageDigest md = MessageDigest.getInstance("MD5");
            if(null == charsetName || charsetName.isEmpty()){
                resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
            }else{
                resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetName)));
            }
        }catch (Exception e){
            Log.e("MD5Utils",e.toString());
        }
        return resultString;
    }


    public static String byteArrayToHexString(byte b[]){
        StringBuilder resultSb = new StringBuilder();
        for (byte value : b) {
            resultSb.append(byteToHexString(value));
        }
        return resultSb.toString();
    }

    public static String byteToHexString(byte b){
        int n = b;
        if(n < 0){
            n += 256;
        }
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigIts[d1] + hexDigIts[d2];
    }
}
